Malicious PDF — malware analysis report

Static analysis result for SHA-256 4628c2131816732a…

MALICIOUS

PDF

80.5 KB Created: 2021-09-21 00:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee9808e4a591ed5a606865147bae7fb5 SHA-1: a5d2de7f92354d10643599225c9cf4cb677eca34 SHA-256: 4628c2131816732aaac028161bf29a1464c689380550911dbfc58b869ac8fba7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO manipulation. No scripts were extracted, but the structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cructi.ru/uplcv?utm_term=japanese+candlestick+ebook
    • https://pcparts.fr/ckfinder/userfiles/files/nuzexodetajetegosorit.pdf
    • https://maritime-models.com/userfiles/file/sirumuxoduv.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff88ca1d03---37845474748.pdf
    • http://brukikostka.pl/uploads/page/file/zejonumepexego.pdf
    • http://psychologadamczak.pl/userfiles/file/fotekukavaxas.pdf
    • http://xn--tnqz8hz5cb8l.com/upload/files/81642585019.pdf
    • http://boek.se/bilder_umeny/File/tajosuzakukavozu.pdf
    • http://pogologistics.com/ckfinder/userfiles/files/37091059689.pdf
    • https://hiperaktivite.info/userfiles/files/61386868874.pdf
    • https://adamant54.ru/userfiles/files/lagetufabimej.pdf
    • http://sladkiy-ostrov.ru/userfiles/files/75186299527.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148fad147ae3---52335273998.pdf
    • https://ost-fogging.com/upload/files/1606884938.pdf
    • https://tvmreza.tv/ckfinder/userfiles/files/zudosarujurupaluzeveb.pdf
    • http://dydlhx.com/upfiles/file///lesuzivo.pdf
    • https://saigonservices.vn/images/uploads/files/wovopaperimofumilobosi.pdf
    • http://innotack.com/userfiles/files/xutomilekikugewilavawi.pdf
    • http://gaziogluenerji.com/images_upload/files/37302490173.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e08c0b32a0---69363810907.pdf
    • https://harrisitalia.it/uploads/file/14525365635.pdf
    • https://berbagiangka.com/contents/files/10882439774.pdf
    • http://roomyab.ir/basefile/roomyabir/files/39367024523.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5e1.bin
26df726d8cd0586a0c99f64c862aeee8ece3a3df9b6f712ed14b3593113c1266		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E1 17940 bytes
font_01_sfnt_off00010452.bin
8f75d5ce8e7b730f9f4cb06418cfe9e9864d75b0cf907d4e6b780046cae81571		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10452 10632 bytes
font_02_sfnt_off00011c88.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C88 16792 bytes

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